2

Be careful:
Each cream is for something different. Some on your list is for acne and some is for hyperpigmentation and the steroid cream is for inflammation but it can thin your skin. The others can cause sun burn so only use at night and put it only on the area it is prescribed for.
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3

AHA's:
Alpha hydroxy acids include glycolic acid but also other fruit acids such as lactic or malic or citric , etc. The aha's are somewhat effective in reversing acne and aging of the skin.
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7

Likely not:
The red scars are a part of the healing process overall. The agents you listed tend to inhibit melanin production which is a darker pigment. The red is partially vascular in nature. The products may diminish the red to a small degree
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8

Different chemicals:
They are all beneficial but are different. They stimulate skin to rapidly exfoliate, make new smoother skin and stimulate collagen&elastin. Tretinoin and Retinol come from Vit.A .
Retin A:brand of Tretinoin, best effect, mostirritation,Script only.
Retinol :midpotency, midirritant, OTC
Glycolic acid is from Sugar. Lesser exfoliation and improvement of collagen&elastin, OTC, better for dry skin
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9

Mildly effective:
Patients can expect a mild improvement from these acids that peel the epidermis. In-office peels with higher concentration will provide deeper peeling and more noticeable results.
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10

Not necessarily:
Bad or good. It is a very weak "lightener" of skin, so people do often use it for issues like melasma. But like with any cream you can react to it and alterations in pigmentation can make your skin more sensitive to the sun. Remember most facial products containing kojic acid contain other products which add further properties to the product(s) beside "lightening".
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11

Benzyl/salicylic aci:
One has to try benzyl proxide low strength like 2.5% and if tolerated can be increased to 5%., not cream but wash .But if not tolerated than you can try 1%salicylic acid and can be increased to 2% if tolerated.
You have to try what your skin can tolearate, it varies from perso0n to person.If in doubt, consult your md/dermatologist.
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12

Leave it alone:
None of these are likely to "help". Please forgive my frankness. Many folks have "poikiloderma", skin of varying colors. If you have freckles and don't want them, a sunscreen may help some. Nobody worth knowing cares whether your skin tone is "uneven". Appearance is about physical fitness and how you carry yourself and interact with others. Focus on what you can manage and you'll look fantastic.
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14

Qualified yes:
Differin (adapalene) can make you more sensitive to the sun. So if differin (adapalene) is increasing sensitivity to sunlight or causing irritation it is possible that the skin color can darken. Use sunscreen/avoid the sun. Darkening is more prominent in darker baseline skin colors.
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20

Topical clindamycin:
This medication is designed to treat acne, so the active ingredient is an antibiotic- clindamycin which targets the germ that causes acne- P. acnes. There are other compounds in the lotion, including cetostearyl alcohol (2.5%) and isostearyl alcohol (2.5%) which could cause skin irritation. (A side effect in about 10% of patients). Talk to a dermatologist about moisturizers given your acne problem
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